Pitman.



J. P. GARDNER.

'PlTM AN.

APPLICATION man MW. 30. 1917.

Patented Apr. 9, 1918.

Pflawdrzar JOHN P. GARDNER, OF SAN FRANCISCO, CALIFORNIA.

PITMAN.

Specification of Letters Patent.

Patented Apr. 9. 191 8.

Application filed. November 30, 1917. Serial N 0. 204,70.-

T 0 all whom it may concern Be it known that I, Jenn P. GARDNER, a citizen of the United States, residing at San Francisco, in the county or San Francisco and State of California, have invented certain new and useful Improvements in Pitmen; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improvement in yieldable pitman rods and connections therefor and more particularly to an improvementon the pitman shown in Patent Number 1,166,452 issued to me January 1th, 1916,and the primary object of the invention isto provide a simple type of connection for the yieldable pitman rod for connecting the same to the pitman wheel and reciprocating cutting member.

Another object of the invention is the pro vision of sectional hearings or straps formed in two parts and pivoted together and held in operative position by spring means for engaging the crank pin of a pitman wheel and the ball on the cutting member, so that the yieldable pitman rod can be readily removed from the machine, when sodesired and the bearings replaced when worn out.

A further object of the invention is to generally improve andsimplify the yieldable type of pitman rod and connection therefor and to provide a durable and ellicientdevice, which will be easy to manufacture and that can be placed upon the market at a reasonable price.

With these and other objects in view the invention consists in the novel construction, arrangement and formation of parts as will be hereinafter more specifically described, claimed and illustrated in the ac ompanying d 'awings, forming a part thereof, in which:

Figure 1 is a side elevation showing an improved yieldable pitman rod and the connections therefor.

Fig. 2 is a plan view partly in section.

nate corresponding parts throughout the several views, 1 designates the improved pitman rod, which includes a cylindrical casing 2 which is threaded at both ends at caps *l: and respectively are fitted 0n the opposite ends of the casing and the cap 4-. receives one end of a rod (3. Each end of the rod (5 is threaded as at 7 and 'an internally threaded aperture 8 is provided within the cap 4 and receives the rod. The opposite end of the rod is threaded into an aperture formed in the extended arm 9 carried by the bearing 10 'for engaging the reciln'ocating member 11. The reciprocating -member 11 includes an upstanding vertical rib 12 which terminates in an ear 13 which has integrally formed thereon the ball '14: which receives the bearing 10 which will be hereinafter more specifically described.

The bearing 10 consists of two substantially semi-s1 )herical shaped members 15 and 16 respectively. The semi-spherical members are pivotally connected together at their outer ends by means of a'pivot pin 17 and these members are fitted around the ball 14. The semi-spherical member 16 carries the extended arm 9 which receives the outer end of the rod 6. The semi-spherical member 14 carries the relatively short arm 17 which terminates in an enlargement 18. A pin 19 is slidably carried by the arm 9 and has secured thereto the cup shaped menr ber 20. A spring is coiled around the pin and normally holds the same in an extended position. A bale 21 is carried by the cup shaped. member 20 and ls'plvoted to the same at- 252 and this bale is adapted to be swung around the relatively short arm 17 and over the enlargement 18 and holds the semi spherical members in clamped position around the ball let.

i Extending. through the cap 5 is a piston rod 23, on which a piston 21 is secured by means of a-nut 2". The piston, 24; is pro 'vided'with the usual packing 26 and is mounted to reciprocate in said cylindrical casing; a coil spring 27 is arranged in the cylindrical"casingQ and surrounds the piston rod 23 and is interposed between the pisten 24- and the cap 5 and acts to normally hold the piston 24; yieldably spaced apart from the cap 5.

The opposite end of the piston rod 23, is connected. to the crank pin 28 of a pitman wheel 29 by means of the strap or bearing 29. The strap, or bearing member 29' in a eludes two substantially semicircular namf bers. 30 and 31 respectively which are pivotally secured together as at 32 hy means of a pivot pin 33. The end of the semi-circular member 30 opposite from the pivot 32 is extended to form the relatively long arm. 3 2' which is enlarged at itsouter end as at 35. "PL lit: .l. 1 M.

3.7 of the piston rod '23. The semi-circular member 31 has its end. opposite the pivot 32 1 extended to form a relatively short arm 38 which terminates in an enlargement 39 forming retaining ear; A pin a0 is slid-- ably mounted in an aperture il formed in' the arm 84: and has rigidly securedat its upper endthe cup shaped member- 42 which receives the upper end of the expansion coil spring 4 .3 which is coiled around the pin in its extended position. A U-shaped bale 4A; is pivoted to the cup shaped member 42 by means of pins 45 and this bale is adapted to be swung over the car 39, turned on the r arm 38 to normally hold the menibers 30 2.

and 31 together and on the crank pin 29.

Suitable brasses d6 are carried by the semicircular members 30 and 31 for engagement with the Wrist pin. The end of the wrist pin is threaded as at l-9 and a suitable nut 48 engages the same, which prevents the accidental displacement of the semi-circular members 30 and' l. A coil spring 50 is wound around the piston rod 23 and engages the cap amid awasher 51 which is o- 'sit'ioned against the enlargement 35, which receives the end of the piston rod and this coil spring counteracts the tension of Hie is practice, I have found that the form of my invention, illustrated in the acconr panying drawings and referred to in the above description, as the preferred embodiments, is the most efficient and practical; yet realizingthe conditions concurrent with the adoption of my device will necessarily vary, I desire to emphasize the fact that various 5e end. 35 is provided with the threa'ded bore 36 which receives the threaded end 3 i a device of the :1 ,eea,

minor changes in details of construction, proportion and arrangement of parts may be resorted to, when required, without sac- I 'rificing any oi the advantages of my in vention as set forth.

ii hat I claim. as new is l. in a device of the ch'aractedescribed,

a yieldahle pitman rod, sectional bearings for engaging the reciprocating cutting member and pitinan wheel respectively, the sections of said bearings being pivotally secured together, means for attaching the ends of the pitinan rod to the hearings, and means for hold' the sections of the hearings to gether.

2. In a-device of the character described,

va yieldable pitman rod, split hearings for engaging the reciprocatin cutting member and pitinan wheel respectively of a mowing machine, the sections of the hearings being pivotally secured together, means for de tachably securing the ends of the pitman rod to the hearings, and means for yieldahly holding the sections of the hearings to gether.

3. In a device of the describe-d yieldalole pitlnan. rod, split hearings engaging the reciprocating cutting :nemher' and pitman Wheel of a mowing machine, the

. sections of said bearings being pivotally secured together, means for detachably securing the ends of the rods to the bearings,

and spring meanscarried by one or the sec tions of the bearings for engaging the other section of the bearing for normally holding thebearings in locked position.

class described, a t hearings for enyielda 51c .pit manro d, sp

gaging the reciprocatnigfe lit-tingmember and e pitnian wheel of a nnrvin; machine, the scctions of said bearings "being pivdtally so cured together, an extended arm carried. by one section of each hearing, means detach ably securing the ends the pit-man to the extended arms of the hearings, a rela tively short arm carried on said hearing, and spring" means carr by said relatively longer arm of the split hearingfor engagement with the relativelyshorter arm oi said hearing-for normally holding the hearings in position, as for the purpose specified.

' in testimony whereof I my signature in presence of two witnesses.

JQHN P. GARDNER. Witnesses:

- Anni. Lnnncnnn, Roi-sear Gammon.

by the other section 

